, Volume 20, Issue 7, pp 1093-1100

Improving Relative Bioavailability of Dicumarol by Reducing Particle Size and Adding the Adhesive Poly(Fumaric-Co-Sebacic) Anhydride

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Abstract

Purpose. This study was carried out to show the effect of particle size reduction and bioadhesion on the dissolution and relative bioavailability of dicumarol.

Methods. Formulations were produced by a variety of methods including a novel technique to reduce particle size as well as phase inversion with poly(fumaric-co-sebacic)anhydride p(FA:SA) to create nanospheres. Drug was administered to groups of pigs and rats via oral gavage of a suspension, and dicumarol concentration in the blood was measured using a double extraction technique.

Results. In vitro results showed improved dissolution in both the micronized formulation and the encapsulated p(FA:SA) nanospheres. In vivo, relative bioavailability of a spray-dried formulation was increased by 17% in the rat and 72% in the pig by further reduction in particle size. The bioadhesive p(FA:SA) formulation also improved relative bioavailability over the spray-dried drug, increasing it by 55% in the rat and 96% in the pig. Additionally, the p(FA:SA) formulation prolonged Tmax and decreased Cmax in both species.

Conclusion. This work demonstrates the importance of particle size and bioadhesion to improve oral bioavailability of ducumarol.